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Genetic basis of hyperlysinemia

  • BACKGROUND Hyperlysinemia is an autosomal recessive inborn error of L-lysine degradation. To date only one causal mutation in the AASS gene encoding α-aminoadipic semialdehyde synthase has been reported. We aimed to better define the genetic basis of hyperlysinemia. METHODS We collected the clinical, biochemical and molecular data in a cohort of 8 hyperlysinemia patients with distinct neurological features. RESULTS We found novel causal mutations in AASS in all affected individuals, including 4 missense mutations, 2 deletions and 1 duplication. In two patients originating from one family, the hyperlysinemia was caused by a contiguous gene deletion syndrome affecting AASS and PTPRZ1. CONCLUSIONS Hyperlysinemia is caused by mutations in AASS. As hyperlysinemia is generally considered a benign metabolic variant, the more severe neurological disease course in two patients with a contiguous deletion syndrome may be explained by the additional loss of PTPRZ1. Our findings illustrate the importance of detailed biochemical and genetic studies in any hyperlysinemia patient.

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Document Type:Article
Author:Sander M. Houten, Heleen te Brinke, Simone Denis, Jos Pn Ruiter, Alida C. Knegt, Johannis Bc de Klerk, Persephone Augoustides-Savvopoulou, Johannes Häberle, Matthias R. Baumgartner, Turgay Coşkun, Johannes Zschocke, Jörn Oliver Sass, Bwee Tien Poll-The, Ronald Ja Wanders, Marinus Duran
Parent Title (English):Orphanet J Rare Dis. (Orphanet Journal of Rare Diseases)
First Page:57
Pubmed Id:
Publisher:BioMed Central
Publication year:2013
Departments, institutes and facilities:Institut für funktionale Gen-Analytik (IFGA)
Dewey Decimal Classification (DDC):6 Technik, Medizin, angewandte Wissenschaften / 61 Medizin und Gesundheit / 610 Medizin und Gesundheit
Entry in this database:2018/08/18